//  Source File Name: Updat.sqlj  1.3
//  
//   Licensed Materials -- Property of IBM 
//  
//   (c) Copyright International Business Machines Corporation, 1998. 
//       All Rights Reserved. 
//  
//   US Government Users Restricted Rights - 
//   Use, duplication or disclosure restricted by 
//   GSA ADP Schedule Contract with IBM Corp. 

//   This sample program shows how to write  
//   a basic static embedded SQL UPDATE/DELETE/INSERT application(SQLJ). 

//  For more information about this sample, refer to the README file. 

//  For more information on Programming in Java, refer to the  
//  "Programming in Java" section of the Application Development Guide. 

//  For more information on building and running Java programs for DB2, 
//  refer to the "Building Java Applets and Applications" section of the  
//  Application Building Guide. 

//  For more information on the SQL language, refer to the SQL Reference. 

import java.sql.*;
import sqlj.runtime.*;
import sqlj.runtime.ref.*;


class Updat 
{   static
    {   try
        {   Class.forName ("COM.ibm.db2.jdbc.app.DB2Driver").newInstance ();
        }
        catch (Exception e)
        {   System.out.println ("\n  Error loading DB2 Driver...\n");
            System.out.println (e);
            System.exit(1);
        }
    }


    public static void main(String argv[])
    {   try 
        {   System.out.println ("\n  Java Updat Sample");

            String url = "jdbc:db2:sample";       //  URL is jdbc:db2:dbname 
            Connection con = null;          

            //  Set the connection                  /* :rk.3:erk. */ 
            if (argv.length == 0) 
            {   //  connect with default id/password 
                con = DriverManager.getConnection(url);  
            }
            else if (argv.length == 2)
            {   String userid = argv[0];
                String passwd = argv[1];

                //  connect with user-provided username and password 
                con = DriverManager.getConnection(url, userid, passwd); 
            }
            else 
            {   throw new Exception("\nUsage: java Updat [username password]\n");
            } 

            //  Set the default context 
            DefaultContext ctx = new DefaultContext(con);            
            DefaultContext.setDefaultContext(ctx);

            //  Enable transactions 
            con.setAutoCommit(false);

            //  UPDATE/DELETE/INSERT 
            try
            {   String jobUpdate = null;
 
                jobUpdate="Clerk";
                #sql {UPDATE staff SET job = :jobUpdate WHERE job = 'Mgr'};  /* :rk.4:erk. */
                System.out.println("\nAll 'Mgr' have been demoted to 'Clerk'!");

                jobUpdate="Sales";
                #sql {DELETE FROM staff WHERE job = :jobUpdate};
                System.out.println("All 'Sales' people have been deleted!"); /* :rk.5:erk. */
 
                #sql {INSERT INTO staff VALUES (999, 'Testing', 99, :jobUpdate, 0, 0, 0)}; /* :rk.6:erk. */
                System.out.println("New data has been inserted");
            }
            catch( Exception e )
            {   throw e; 
            } 
            finally
            {   //  Rollback the transaction 
                System.out.println("\nRollback the transaction...");
                #sql { ROLLBACK };                                          /* :rk.7:erk. */
                System.out.println("Rollback done."); 
            }
        }
        catch (Exception e)
        {   System.out.println (e);
        }
    }
}